(2)(a) A person commits domestic battery by strangulation if the person knowingly and intentionally, against the will of another, impedes the normal breathing or circulation of the blood of a family or household member or of a person with whom he or she is in a dating relationship, so as to create a risk of or cause great bodily harm by applying pressure on the throat or neck of the other person or by blocking the nose or mouth of the other person. This paragraph does not apply to any act of medical diagnosis, treatment, or prescription which is authorized under the laws of this state.